Stourton started his career as a comedian at university, performing in the web-series "High Renaissance Man" that he co-wrote with Tom Palmer.

As of 2014, he joined the cast of Thomas & Friends as the voices of Duncan, Rex, Terence, Alfie (season 23 onward), and the Fat Clergyman (UK/US).

In 2018, Stourton played the role of Edward Snowden in the comedy film The Spy Who Dumped Me, featuring Mila Kunis, Kate McKinnon and Justin Theroux.

[3] That same year he began playing the recurring role of Robbie, the rival agent, across all three series of Stath Lets Flats.

[5] That year he also appeared in the BBC pilot Dreaming Whilst Black, guest starred in episodes of Trying, Buffering and Mood, as well as providing voices for the rebooted series of Spitting Image.